262 BRITISH AVONIAN CONODONT FAUNAS 
Z ZONE 
a 
ox 
———_—____—  AVONIAN 
No. of specimens Total weight of 
Total weight of sample sample in 
kilograms 
Abundance = 
Fic. 75. Lithological section of the Zaphrentis Zone in Oreton Quarry, Shropshire, (SO 
648806). 
o 
OL 
C0) —_————————— 
YOREDALE 
° 20 ao 60 60 
Abundance factor- Jotalno.of specimens Total weight of sample 
Total weight of sample in kilograms. 
Fic. 76. Composite lithological section through the Yoredale Group (Hawes Limestone 
to base of Simonstone Limestone) in the Gayle Beck—Hawes area (34/864883). 
